| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Canada | 1 | |
| #3 | China | 1 | |
| #4 | EPO (European Patent Office) | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | Japan | 1 | |
| #7 | Mexico | 1 | |
| #8 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Measurement | |
| #2 | Machines | |
| #3 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Analysing materials | |
| #2 | Unspecified technologies | |
| #3 | Special measuring | |
| #4 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Mullen James G | 4 |
| #2 | Borgersen Roland | 3 |
| #3 | Biddle Ernest L | 3 |
| #4 | Borgersen Roland D | 3 |
| #5 | Jobe William L | 1 |
| #6 | Lineberger James W | 1 |
| #7 | Roorando Boojiyaasen | 1 |
| #8 | Jieimusu Jii Muuren | 1 |
| #9 | Borgersen Roy H | 1 |
| Publication | Filing date | Title |
|---|---|---|
| WO2013033291A1 | Portable brinell hardness tester | |
| US4361034A | Portable hardness tester | |
| US4312220A | Portable hardness tester | |
| US3129582A | Portable hardness tester | |
| US3029631A | Apparatus for measuring hardness |